[arch-projects] [mkinitcpio PATCH 1/3] /run/initramfs: copy the whole ramfs

[Dave Reisner]

On Fri, Nov 18, 2011 at 12:44:51AM -0300, Gerardo Exequiel Pozzi wrote:
> On 11/18/2011 12:22 AM, Dave Reisner wrote:
> >On Fri, Nov 18, 2011 at 12:12:28AM -0300, Gerardo Exequiel Pozzi wrote:
> >>On 11/18/2011 12:03 AM, Dave Reisner wrote:
> >>>No, that absolutely _will_ work. Binding arbitrary directories is
> >>>totally kosher, and I do it fairly frequently. You can even bind mount
> >>>files, i.e.
> >>>
> >>>   echo blah>   foo
> >>>   touch bar
> >>>   mount -B foo bar
> >>>
> >>>When you 'cat bar' it will have the same contents as 'foo'.
> >>I know, but again, rootfs is the *HEAD* of vfsmount.
> >>
> >>[ramfs /]# mkdir a b
> >>[ramfs /]# mount --bind a b
> >>mount: mounting a on b failed: Invalid argument
> >>[ramfs /]# mkdir coco
> >>[ramfs /]# mount -t tmpfs coco coco
> >>[ramfs /]# cd coco/
> >>[ramfs /coco]# mkdir a b
> >>[ramfs /coco]# mount --bind a b
> >>[ramfs /coco]#
> >>
> >Ahh, there's the lightbulb. More specifically, directories in the root
> >can't be bind mounted. Seems the inverse doesn't hold true.
> Not exactly. you are mixing things.
> /run is on another filesystem
> 
> When I say rootfs I talk about of a type of filesystem.
> 
> Do not confuse, rootfs (an special tmpfs/ramfs is the head, it does
> not have a name, you can not reference, this implies you can not
> unmount, bind, move and pivot).
> 
> 

d'oh, right. poor place to test my assumptions. time for sleep, dave.
yeah, it all makes sense.

> >
> >[ramfs /]# mkdir /a
> >[ramfs /]# mount -B /run/initramfs/ /a
> works because you are binding a tmpfs.
> repeat the same with /somedir/lalala, the result is exactly as below....
> >[ramfs /]# umount /a
> 
> >[ramfs /]# mount -B /a /run/initramfs/
> >mount: wrong fs type, bad option, bad superblock on /a,
> >        missing codepage or helper program, or other error
> >        In some cases useful info is found in syslog - try
> >        dmesg | tail  or so
> does not works because you are trying to reference an "unnamed"
> mountpoint. There is no "source" for such fs.
> 
> 
> >
> >(oh the joys of the soul-less vacuum that is early userspace)
> >
> >d
> 
> haha :P
> 
> -- 
> Gerardo Exequiel Pozzi
> \cos^2\alpha + \sin^2\alpha = 1
> 
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